CN102943266B - High abrasion-proof laser cladding cobalt-base alloy powder and preparation method thereof - Google Patents
High abrasion-proof laser cladding cobalt-base alloy powder and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high abrasion-proof laser cladding cobalt-base alloy powder and a preparation method of the alloy powder. The high abrasion-proof laser cladding cobalt-base alloy powder is characterized by comprising matrix alloy powder, hard carbide particles and a bonding agent; and the combined powder comprises 50-98% of matrix alloy powder, 1-45% of WC or TiC or mixed powder of WC and TiC, and 1-5% of bonding agent. The preparation method comprises the following steps of: preparing the matrix alloy powder, adding the carbide particles into the prepared matrix alloy powder, adding bonding agent into the mixture, stirring, ball milling, combining the powder, drying, crushing and screening. The high abrasion-proof laser cladding cobalt-base alloy powder not only is high in hardness and toughness, but also has excellent wear resistance and corrosion resistance, thus being especially suitable for laser cladding of parts with high impact resistance and high abrasion-proof property. Furthermore, the phenomenon of segregation caused by great differences among the specific gravities of all components in the processes of storage, transportation and using can be effectively prevented.
Description
Technical field
The invention belongs to cobalt base alloy technical field, relate to a kind of cladding alloy powder and preparation method thereof, particularly a kind of laser melting coating high abrasion Co-based alloy powder and preparation method thereof, this high abrasion Co-based alloy powder is applicable to laser melting coating high abrasion operating mode component.
Background technology
In modern daily life and industrial production, the attrition and attack of metallic substance there will be in every field, one of two large major ways that destroy component of machine, engineering component, corrosion will cause a large amount of consumption of mechanical component, and wearing and tearing are to cause one of major reason of mechanical component inefficacy.They,, in a large amount of metallic substance of loss, have also wasted ample resources, occupy very large proportion in financial loss.
The inefficacy of the engineering component that high temperature, burn into friction and wear cause occurs in surface mostly, and this phenomenon is impelled the very big concern of Materials science worker to material surface, and impels the fast development of material surface modifying technology.People wish when material monolithic keeps enough toughness and intensity, make material surface obtain higher, specific use properties, as wear-resisting, anti-corrosion and anti-oxidant etc.
It is reported, at present, in whole world industrialized country, the energy consuming in wearing and tearing accounts for 1/2nd of total energy, approximately has 60%～80% component of machine because wearing and tearing were lost efficacy.A highly developed industrialized country, the financial loss causing because of wearing and tearing every year almost accounts for 1%～2% of total value of production in national economy.For example, the financial loss that the U.S. causes due to wearing and tearing is every year on average up to 20,000,000,000 dollars; The financial loss that Britain is caused by wearing and tearing every year on average exceedes 51,500 ten thousand pounds.In China, the financial loss being caused by wearing and tearing is equally also quite serious.Only according to department's rough Statistics such as oil, chemical industry, coal, electric power, agricultural machinery, just there is steel consumption up to millions of tons in China every year in wearing and tearing, and financial loss reaches 200～30,000,000,000 yuan more than.Thus, the effect of attrition of metallic substance performance quality and the work-ing life of mechanical component, and then affects the competitive capacity of these mechanical component on market.
Meanwhile, metallic corrosion problem also spreads all over national economy every field, from the industrial and agricultural production that is applied to of top science technology, and the manufacture that is applied to national defense industry from daily life, the place of every use metallic substance, all exists etching problem in varying degrees.According to relevant expert's statistics, each point, whole world half just has one ton of steel to be etched into iron rust.For example, 1975, the financial loss that the U.S. is caused by corrosion every year, up to 82,000,000,000 dollars, accounted for 4.9% of total value of production in national economy; Nineteen ninety-five, the financial loss straight line that the U.S. causes due to corrosion rises to 3,000 hundred million dollars.Statistics shows, in a country that industry is flourishing, the financial loss causing because of corrosion accounts for 2%～4% of total value of production in national economy, exceedes the summation of the loss that all natural disasteies such as floods, fire, earthquake and ancient measure of length, equal to 8 cun wind cause.Although China is only a developing country, because the loss that corrosion brings is also considerable, annual about 5,000 hundred million yuans, account for 6% left and right of Chinese national economy total output value.The financial loss only being caused by corrosion every year in oil and gas field is with regard to approximately 10,000,000,000 yuan, and the fund waste that coal-mining industry is caused by corrosion is every year about 55.6 hundred million yuan, nearly 1,700,000,000 yuan of the annual corrosion loss of power system.
Therefore, from limited resources and the energy, modern demand of industrial production component of machine has enough wear and corrosion behaviors, can extremely under rugged environment, work long hours at high temperature, high loading etc., and the attrition and attack problem that therefore solves metal is extremely urgent.
Laser melting coating ceramic technology can combine obdurability high metal, good manufacturability and wear-resisting, anti-corrosion, the high temperature resistant and anti-oxidation characteristics of stupalith excellence, for the surface strengthening technology of most worthy and competitive power, it is also one of focus of laser melting and coating technique development.
Laser melting coating is the technology of emerging a, fast development, it is under high-energy-density laser beam irradiation, matrix surface skim melts with the alloy adding as required simultaneously, forming thickness is 10～1000 μ m surface melting layers, the processing method that rapid solidification requires to meet a certain property, be a new technology of the multidisciplinary intersection such as material interaction and rapid solidification moulding in set laser heat fused, molten bath, this technology obtains more careful research aspect surface treatment.
Because local surfaces is subject to heat density large, spot diameter is little, and heated time is short, therefore melting area is very little on workpiece surface, passes to inside workpiece less calories, has very large thermograde in melting area, and speed of cooling can reach 10
4～10
9dEG C/s.Just because of rapid solidification, give the feature that alloy is different from normal freezing.As the laser melting coating of one of surface modification means, be suitable for top layer modification and the reparation of each metalloid.Cladding laser surfaces can keep former coating alloy composition (thinning ratio 5～8%), only has very limited phase diffusion zone at the intersection of reflow zone and matrix, and that this spreading area is realized the metallurgical binding of coat and matrix is just necessary.It is upper that it can be coated in common material (workpiece) high performance powdered alloy, thereby obtain the top coat (as good coatings such as heat-resisting, anti-corrosion, wear-resisting, shock resistances) of excellent specific property.
Compared with traditional surface modification (thermospray, plasma spraying etc.) technology, it mainly contains following advantage: interface is metallurgical binding; Organize superfine; Cladding layer composition is even and extent of dilution is low; Coating thickness is controlled; Heat distortion is little; Easily realize constituency cladding and technological process and easily realize automatization.In process for modifying surface, laser melting coating has become more active research field.
Laser surface coating technology is one of the advanced subject in the material surface engineering field that grows up of middle nineteen seventies, both at home and abroad just flourish.Along with the development and perfection of superpower laser and supporting technology, it progressively moves towards industrial application from laboratory study, will have powerful vitality in following material surface modifying field.Laser melting coating both can be used for the surface modification of traditional material, promoted the performance of material, can be used for again the reparation of surface failure part, therefore available body material is very extensive, as carbon steel, steel alloy, cast iron and aluminium alloy, copper alloy, nickel base superalloy etc.In addition, material scientific research personnel has also developed non-crystalline state and quasi crystal coating etc.At present, more at the study on the modification on traditional material surface to laser technology both at home and abroad, the research of high quality steel, high-temperature alloy surface modification also has report, but the practical engineering application that application laser melting coating is repaired some components of machine but awaits further popularization, major cause is in laser cladding process, often to have the problems such as crackle, coating be inhomogeneous, awaits the further research of scientific worker.
That the state of laser melting coating layer material generally has is Powdered, thread, paste etc.In addition also can be using sheet metal, sintered metal product, steel band and welding rod etc. as cladding material, wherein powdered alloy is most widely used in laser melting and coating technique.
Depending on the practical service environment condition difference of workpiece, also different to the performance requriements of surface coating.Cladding alloy system mainly contains ferrous alloy, nickel-base alloy, cobalt-base alloy and complex alloy powder etc.It is local wear-resisting and hold yielding part that iron(-)base powder is suitable for requirement; Nickel-base alloy is suitable for that requirement part is wear-resisting, the member of heat and corrosion resistant and thermal fatigue resistance, and required laser power density is slightly higher than cladding ferrous alloy; Cobalt-base alloy coating is suitable for the part of wear-resisting, the anti-corrosion and thermal fatigue resistance of requirement; Ceramic coating at high temperature has higher intensity, and Heat stability is good, and chemical stability is high, is applicable to the part of wear-resisting, anti-corrosion, high temperature resistant and oxidation-resistance.
Wear-resistant coating is in laser melting coating ceramic coating, to study to such an extent that be also maximum a kind the earliest.Although Ni base, Co base, Fe base self-fluxing alloy itself just have good wear-resisting, anti-corrosion, resistance toheat, utilize their laser cladding layer to carry out the research report of material surface strengthening a lot.But under the serious condition of slip, gouging abrasion and abrasive wear, simple Ni base, Co base, the not competent service requirements of Fe base self-melting alloy.
Matrix material is a kind of novel surface strengthening engineering materials, metal and metal, metal and pottery, pottery and pottery etc., and the range of choice of the collocation between powdered alloy and between powdered alloy and pottery is very extensive.Recent domestic has been carried out the various dystectic carbide, nitride, boride and the ceramic oxide particle that in the powdered alloy system of above-mentioned laser melting coating, add certain content for this reason, make the even pure ceramic coating of cermet composite coating, to improve the wear resistance of cladding layer.
Can prepare high performance composite coating although adopt matrix material to carry out laser melting coating, but at present domestic most still research in laboratory, and its preparation technology adopts nickel-based self-fluxing alloy to mix with the WC powder of certain content in laboratory, then add saturated turps or homemade organic binder bond, furnishing slip or paste, precoating is overlying on workpiece, then carries out laser melting coating or sintering.Its hard particles adding is large, density is different from matrix metal, and the distribution of particle in cladding layer is often inhomogeneous, conventionally presents Gradient distribution; Wettability, stability, the coefficient of expansion and the chemical reactivities etc. of added particulate material and matrix all cause the ununiformity of the microstructure and property of cladding layer.And prepared combination powder is because each constituent element proportion differs greatly, thereby in storage, transport and use procedure and easily produce segregation.Cannot carry out commercialization supply, on market, there is not yet at present particle and strengthen the merchandise sales of laser melting coating special powder.For above-mentioned reasons, there is not yet so far laser melting coating special combination powder, thereby restricted the application of laser melting coating on high abrasion operating mode field.
Summary of the invention
The object of the invention is to avoid above-mentioned deficiency of the prior art, develop and a kind ofly can meet a kind of laser melting coating high abrasion Co-based alloy powder required under the serious abrasive wear working condition of engineering machinery and preparation method thereof.
For achieving the above object, the present invention can and add hard compounds and realize with corresponding technology of preparing scheme by the design of following basic chemical composition:
A kind of laser melting coating high abrasion Co-based alloy powder provided by the present invention is made up of matrix alloy powder and carbide hard particle and binding agent, its proportioning is: 50～98% matrix alloy powder, the mixture powder of 1～45% WC or TiC or WC and TiC, 1～5% binding agent is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.1～0.4%C, 3.5～5.5%Si, 1.5～3%B, 1.6～2.5%Mn, 1.0～3.0%Cr, 0.5～2%W, 2.0～3.0%Mo, 0.5～3%Ni, 0.1～0.4%Nb, < 15%Fe, 0.2～0.3%La
2o3,0.4～0.5Y, Co surplus and inevitable impurity element.
Laser melting coating high abrasion Co-based alloy powder provided by the present invention and preparation method thereof, its step of preparation process is:
Matrix alloy powder preparation → interpolation carbide particle → interpolation binding agent → stirring ball-milling → combination powder → dry → broken → screening; Concrete technology step is as follows:
(1) matrix alloy preparation
The technical process of matrix alloy powder preparation is: batching → melting → atomization → dry → screening;
Batching: raw material is pure cobalt, Graphite Powder 99, FeCr, FeB, FeSi, W, Nb, Ni, La
2o, Y;
Melting: the above-mentioned raw material preparing is carried out to melting in vacuum induction furnace or medium-frequency induction furnace, and temperature of fusion is about 1250 DEG C-1350 DEG C, controls carbon content and reaches requirement, after stokehold adjusting component is qualified, and 1200～1280 DEG C of tapping temperatures;
Atomization: adopt indifferent gas or hydraulic atomized, atomization aperture 5～10mm, atomizing pressure, 10～14MPa;
Dry: equipment used is coated infrared drier, and bake out temperature is 220 DEG C～280 DEG C;
Screening: sift out size range for+150 orders～-350 object powder is as finished powder by powder shifter;
(2) add carbide particle
Choose size range and be the mixture powder of the commercially available WC of+150 orders～-350 object or TiC powder or WC and TiC as strengthening hard particles;
(3) add binding agent
Adopt resol, epoxy resin or the water glass of heat curing-type to make binding agent, add pimelinketone or methanol solvate, make it be dissolved into resin solution;
(4) stirring ball-milling
After the matrix alloy powder preparing and WC or TiC powder and binding agent are configured according to required ratio, pour in agitating ball mill, make it be dissolved into resin solution in pimelinketone or methanol solvate the resin dissolves of required dosage; After stirring, pour in the powder mix of required processing in ball mill, after being prepared according to 2: 1～3: 1 ratio of grinding media to material, the abrading-ball of sphere diameter 10～20mm joins in agitating ball mill, starting agitating ball mill, through the abundant stirring ball-milling of 5～60 hours, the each component of powder mix and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into combination powder;
(5) dry
Combination powder good ball milling is poured out from ball mill, then dry through 150 DEG C～200 DEG C;
(6) broken and screening
Dried combination powder is carried out to fragmentation, sift out size range for+150 orders～-350 object powder is respectively as finished powder by powder shifter, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
Beneficial effect
Compared with prior art, tool of the present invention has the following advantages:
1) the existing higher toughness of laser melting coating high abrasion Co-based alloy powder of the present invention, high hardness, has again excellent wear resistance and solidity to corrosion, and its abrasive wear resistance can be 10 times of rich chromium cast iron, and its solidity to corrosion is suitable with 1Cr18Ni9 Ti.Be applicable to laser melting coating HI high impact, high abrasion operating mode component.
2) laser melting coating high abrasion Co-based alloy powder of the present invention has excellent laser melting and coating process performance, and laser cladding layer after treatment has the advantages such as flawless, pore-free, inclusion-free, dense structure, grain refining.
3) the laser melting coating high abrasion Co-based alloy powder of preparing through technique of the present invention can wrap up each constituent element powder particle, and is bonded together; There is enough cohesive strengths, can effectively prevent that composition powder from producing segregation because each constituent element proportion differs greatly in storage, transport and use procedure.
4) laser melting coating high abrasion Co-based alloy powder of the present invention, be specially adapted to the laser melting coating reparation of the alloy workpiece of high surfaces hardness, toughness and high-wearing feature, gained cladding alloy powder technology performance is good, under the condition without preheating and subsequent heat treatment, can obtain the flawless Laser Clad Alloy Coatings of the large thickness of big area, cladding layer intensity, hardness and wear resistance are high, plasticity and toughness are good, and significantly reduce with powdered alloy cost than existing most of self-fluxing alloy powders used for hot spraying and existing most of laser melting coating.Can reduce the consumption of strategic rare elements, significantly reduce laser melting coating cost.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment mono-
A kind of laser melting coating high abrasion Co-based alloy powder and preparation method thereof, this laser melting coating high abrasion Co-based alloy powder is made up of matrix alloy powder and carbide hard particle and binding agent, its proportioning is: 60% matrix alloy powder, 37 WC, 3% phenolic resin adhesive is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.3%C, 4%Si, 2.5%B, 2.6%Cr, 1.5%W, 2.2%Mn, 0.3%Nb, 2.5%Ni, 13%Fe, 0.3%La
2o
3, 0.4%Y, Co surplus.
Its manufacturing technology steps:
Matrix alloy powder preparation → interpolation carbide particle → interpolation binding agent → stirring ball-milling → combination powder → dry → broken → screening; Concrete technology step is as follows:
(1) matrix alloy preparation
The technical process of matrix alloy powder preparation is: batching → melting → atomization → dry → screening;
Batching: raw material is pure nickel, Graphite Powder 99, FeCr, FeB, FeSi, Cu, Sn, Rare Earth Y, Rare-Earth Ce; By above-mentioned weight percent proportioning, be ready to make the starting material of matrix metal powder.
Melting: start vacuum induction intermediate frequency furnace, by the requirement of melting technology, put into metal and start melting, the metal of general easy oxidation was put in the later stage of fusing.Temperature of fusion is approximately controlled at 1250-1300 DEG C; When the metal of this stove all after fusing, carries out slag making in stove, remove the impurity in molten metal, then enter refining period and carry out refining, before cast, add reductor to carry out deoxidation, control carbon content and reach requirement, after stokehold adjusting component is qualified, tapping temperature is controlled at 1200～1250 DEG C.
Atomization: alloy liquid qualified melting is poured in cone bottom pour ladle, start to carry out the atomization of metal-powder, open high-pressure inert gas, using the high pressure gas from gas cylinder as air knife, to becoming the molten metal bath stream of a thread to cut atomization after the constraint of leting slip a remark that is 5～10mm through aperture after fusing, atomizing pressure 10～14MPa, by molten drop small metal atomization poling, final set becomes powdered alloy.Metal-powder after solidifying, still quite easily oxidation in the time of high temperature, so must allow its cool to room temperature under the environment of anaerobic or hypoxemia, could reduce the oxygen level of powder.Normal nebulisation time is about 5～20 minutes.
Dry: equipment used is coated infrared drier, approximately 250 DEG C of bake out temperatures, dried metal-powder, the chemical examination of Chemical Composition is carried out in first sampling, proceeds to next procedure after qualified.
Screening: sift out size range for+150 orders～-350 object powder is as finished powder by powder shifter.
(2) add carbide particle
Choose size range for the commercially available WC powder of-250 object is as strengthening hard particles;
(3) add binding agent
Adopt the resol of heat curing-type to make binding agent, add cyclohexanone solvent, make it be dissolved into resin solution;
(4) stirring ball-milling
After the matrix alloy powder preparing and WC powder and binding agent are configured according to above-mentioned ratio, pour in agitating ball mill, the resol of 3% heat curing-type is dissolved in cyclohexanone solvent and makes it be dissolved into resin solution, after stirring, pour in the powder mix of the required processing in ball mill, after being prepared according to 2: 1 ratio of grinding media to material, the abrading-ball of sphere diameter 15mm joins in agitating ball mill, through the abundant stirring ball-milling of 35 hours, the each component of powder mix and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into combination powder,
(5) dry
Combination powder good ball milling is poured out from ball mill, then dry through 180 DEG C;
(6) broken and screening
Dried combination powder is carried out to fragmentation, sift out size range for+150 orders～-350 object powder is as finished powder by powder shifter, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
Sieve packaging warehouse-in by user's requirement.
Embodiment bis-
Resistance to Co-based alloy powder of a kind of laser melting coating high tenacity and preparation method thereof, the high resistance to cobalt alloy powder of this laser melting coating is made up of matrix alloy powder and carbide hard particle and binding agent, its proportioning is: 68% matrix alloy powder, 30 TiC, 2% epoxy adhesive is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.2%C, 5%Si, 3%B, 1.5%Cr, 2.0W, 2.5%Mn, 0.2%Nb, 3%Ni, 12%Fe, 0.2%La
2o
3, 0.5%Y, Co surplus.
(2) add carbide particle
Choose size range for the commercially available WC powder of-300 object is as strengthening hard particles;
(3) add binding agent
Adopt the epoxy resin of heat curing-type to make binding agent, add methanol solvate, make it be dissolved into resin solution;
(4) stirring ball-milling
After the matrix alloy powder preparing and TiC powder and binding agent are configured according to above-mentioned ratio, pour in agitating ball mill, the resol of 2% heat curing-type is dissolved in methanol solvate and makes it be dissolved into resin solution, after stirring, pour in the powder mix of the required processing in ball mill, after being prepared according to 2.5: 1 ratio of grinding media to material, the abrading-ball of sphere diameter 12mm joins in agitating ball mill, through the abundant stirring ball-milling of 5～60 hours, through the abundant stirring ball-milling of 26 hours, the each component of powder mix and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into combination powder,
Its preparation method is identical with embodiment mono-.
Embodiment tri-
A kind of laser melting coating high-toughness wear-resistant Co-based alloy powder and preparation method thereof, this laser melting coating high abrasion Co-based alloy powder is made up of matrix alloy powder and carbide hard particle and binding agent, its proportioning is: 68% matrix alloy powder, 30 TiC, 2% epoxy adhesive is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.4%C, 2.8%Si, 2.0%B, 3%Cr, 2.5%W, 1.8%Mn, 0.25%Nb, 2.0%Ni, 10%Fe, 0.25%La
2o
3, 0.45%Y, Co surplus.
(2) add carbide particle
Choose size range for the commercially available 50%WC of-200 object and 50%TiC form mixture powder as strengthening hard particles;
(3) add binding agent
Adopt water glass to make binding agent, add methanol solvate;
(4) stirring ball-milling
After the matrix alloy powder preparing and TiC powder and binding agent are configured according to above-mentioned ratio, pour in agitating ball mill, 2.5% water glass is incorporated in methanol solvate, after stirring, pour in the powder mix of the required processing in ball mill, after being prepared according to 2.8: 1 ratio of grinding media to material, the abrading-ball of sphere diameter 18mm joins in agitating ball mill, starting agitating ball mill, through the abundant stirring ball-milling of 18 hours, the each component of powder mix and water glass liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into combination powder,
Its preparation method is identical with embodiment mono-.
The laser melting coating high abrasion Co-based alloy powder of the above composition that the present invention proposes, be specially adapted to the laser melting coating on corresponding product surface, the hardness of its cladding layer is high, wear resistance is good, the tendency that produces cracking and other overlay defect is little, can prepare large thickness cladding layer, and laser melting and coating process is functional, use the cost of cladding alloy powder low than now, can be suitable for application widely needs.Material of the present invention is applied has significant economic and social benefit.
Claims (1)
1. the preparation method of laser melting coating high abrasion Co-based alloy powder, it is characterized in that: laser melting coating high abrasion Co-based alloy powder is made up of matrix alloy powder and carbide hard particle and binding agent, its proportioning is: 50～98% matrix alloy powder, the mixture powder of 1～45% WC or TiC or WC and TiC, 1～5% binding agent is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.1～0.4%C, 3.5～5.5%Si, 1.5～3%B, 1.6～2.5%Mn, 1.0～3.0%Cr, 0.5～2%W, 2.0～3.0%Mo, 0.5～3%Ni, 0.1～0.4%Nb, < 15%Fe, 0.2～0.3%La
2o
3, 0.4～0.5% Rare Earth Y, Co surplus and inevitable impurity element; Its step of preparation process is:
Matrix alloy powder system is each → add carbide hard particle → interpolations binding agent → stirring ball-milling → combination powder → dry → fragmentation → sieve; Concrete technology step is as follows:
(1) matrix alloy powder preparation
The technical process of matrix alloy powder preparation is: batching → melting → atomization → dry → screening;
Batching: raw material is pure cobalt, Graphite Powder 99, FeCr, FeB, FeSi, W, Nb, Ni, La
2o, Y;
Melting: the above-mentioned raw material preparing is carried out to melting in vacuum induction furnace or medium-frequency induction furnace, and temperature of fusion is about 1250 DEG C-1350 DEG C, controls carbon content and reaches requirement, after stokehold adjusting component is qualified, and 1200～1280 DEG C of tapping temperatures;
Atomization: adopt indifferent gas or hydraulic atomized, atomization aperture 5～10mm, atomizing pressure 10～14MPa;
Dry: equipment used is coated infrared drier, and bake out temperature is 220 DEG C～280 DEG C;
Screening: sift out size range for+150 orders～-350 object powder is as matrix alloy powder by powder shifter;
(2) add carbide hard particle
Choose size range and be the mixture powder of the commercially available WC of+150 orders～-350 object or TiC powder or WC and TiC as strengthening hard particles;
(3) add binding agent
Adopt resol, epoxy resin or the water glass of heat curing-type to make binding agent, add pimelinketone or methanol solvate, make it be dissolved into resin solution;
(4) stirring ball-milling
After the matrix alloy powder preparing and WC or TiC powder and binding agent are prepared according to required ratio, pour in agitating ball mill, make it be dissolved into resin solution in pimelinketone or methanol solvate the resin dissolves of required dosage; After stirring, pour in the powder mix of required processing in agitating ball mill, after being prepared according to 2: 1～3: 1 ratio of grinding media to material, the abrading-ball of sphere diameter 10～20mm joins in agitating ball mill, start agitating ball mill, through the abundant stirring ball-milling of 5～60 hours, the each component of powder mix and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into combination powder;
(5) dry
Combination powder good ball milling is poured out from ball mill, then dry through 150 DEG C～200 DEG C;
(6) broken and screening
Dried combination powder is carried out to fragmentation, sift out size range for+150 orders～-350 object powder is respectively as finished powder by powder shifter, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
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